If an investor can invest in cash and only one risky portfolio, which risky portfolio should he select? The risk-free interest rate is 3.2% per year. Portfolio Expected return 10.3% 11.4% 12.5% 13.6% 14.8% 1 2 3 4 5 01) 1 02) 2 3) 3 4) 4 Standard deviation 17.5% 18.3% 18.9% 19.2% 19.8%